Question

Black coffee has a pH of 5, therefore its H+ concentration is __________ times greater than a solution with a pH of 10

Answer 1

I think it is 5times greater

Answer 2

Correct answer: 100,000 times

The acids and base are in the multiple of 10 as they increase or decrease in response to each other so it would increase 100,000 times because coffee with the pH of 5 and something that have pH of 10 are five places from each other. Hence, the concentration of H+ ions in a black coffee would be 10*10*10*10*10 that gives the value 100,000.

Hence, the correct answer would be 100,000 times.